Mining machine



April 9, l935- M. P. HoLMEs 1,996,765

MINING MACHINE Filed June 9, 1931 3 Sheets-Sheet 1 hmm April 9, 1935. M, P. HOLMES MINING MACHINEM Filed June 9, 1931 5 Sheets-Sheet 2l April 49, 1935- M. P. HOLMES 1,996,765

MINING MACHINE Filed June` 9, 1951 3 Sheets-Sheet I5 ,Patente-Apu 9,1935 A .59 improve-coal mimagmaeh vmay 31', Mounted on this Wheeled'iiiiok amai keiz Veliitpez'.. Yet another object islrioprovide;

proxid ruelnV Wheel driving.. inechanieigg A "further obieet is-to provide an improiedkexjf fenttei? swinging andltruck wheeidrifinggeaifing VWhere:A in separate transmission gmeehanisms are emv ployed fo effecting kerrelitiiersmringfaoaci'triickv high oxjl'ow, speeds` and har/ing incorporated there? in impro-ved control me'zehanisnfis.Uv Thesearid other "obj'eote and advantages oi, WHL Vlfxoxizevelc?.hereinaiter more. ful; pea?.

` Infthe accompanying 'invention may assume in practice.`

lIn, these drawinga f rFignfi is a plan View of thejillus'trat'ive einbodij` mentfof the iin-provedV minngfnaohinef Eig; aside elevationalviewpfjthe f Y shown in Fig. 1.:

Fig.3 "s

.Fig'. 5y is. aview si coniiiol mechanism, the transmission gearingbei'ngshown in. plan. Y

Fig islal longitudinalyextending Eig-. '111s a Vdetail seotionaiifiuewftaken chine f1-'ame body 4i of@ low compact design enti'onrelafesgtamaohine$`-andmore paxtmiiay ig; machines for cutting egalA j a Cernia, .igimdmoiygexsndjjiigg vertical sectional viewftaken siibvstantiall'yonv'line @www i Y Nowfreferr am rivali spaced equi-distantly from the longitudinal verv tical center ofthe machine.vv The plural speed`V i disc clutch M andthe interlockingmechanism 'MIL` f p 'to' the shaft4|. h'1`he plural"speedgearing'for` vtruck wheeldrive at high and low speeds in one v,direction are driven from the shaft' 33 and the ato the shaft `33 `and meshing With a Worm Wheel VWorm WheelA 38 connectible by Ia vmultiple .disc

` horizontal shaftf4| extending transversely.ofjtllle yhigh for low, l speeds in 1 the reverse direction ,s is

t. interloekingjjmecha y l natively icemflfliibleml devine ,rlatio'n; Wth the' Sheftbrmans 0f. Slidne'clutchesl: 54 'rid- 55:16-?

i" o1 ferai-ingl handles 58 ^and"5'|frespee'ti'vely and are 58fextending centrallylthrouigh' the shaftjdjllfit, Willthus be 'seen"that, 'when oneclutchiscongf nected the other"clutchis mainta edireleased "*li'ITheinterlock g' i' clutchesfxvill jntv; be fdesciibedf fNoW Y referring a vclutch applying member '|3, pivoted shipper drivingk connectionsfor effecting bar swing and 'yoke 74, reciprocable actuating rod 15, threaded nut 18, bevel gears'H, v18 and operating handle loW vspeed gearing comprises a Worm 34 lx'edfeach, connected-through an anti-friction bearing 35 xedyfto ,a vertical''gsha'ftgfSEi.,` Fixedtothe mounted ony ari-enlarged cylindrical portion 82 shaft 36 'is-,az'y'vorr'n 3.1 imeshing withJa'slowljspe'ed Within the frame and through which shaft 4| clutch 38 and an interlocking mechanism' 4|) ,toaA gfextends. The end surfaces of `the member 8| machine frame andy suitably journaledf'therein. in'thevia'djacent vertical end plates of the Worm t wheels.- When -the `c 1utch applying member is xed' to the shaft 83l and;meshing;Withrafhigh speed Worm Wheel43 connectibleby a multiple to effect application ofy theclutches. It will thus effecting bar.r swing and truck ,wheel drive hat; i

movement to theactuatingtrod in one direction drvenirromj thegsnaft sziajnd issimtiarj 11i-icon:-

tt Womitnxedqtttnesnft ai and mesningwitn qneorfthefother 'of their operating"p tsitions..`

iujtcn 5a 4[and fan; interlocking teilig 'Shaft 411;. "The :high Isneed ectible 'by agmultipiej distA cluttgh and the ed Withinradielchambers 88 formed in thee Ir1` 5|A to. the Shaftll'. It

endsof, theplungers, Awhen, in the position shown mayjbefdriven *at eithea high or alowspeed in-jligflengage slots "origrooves'g out in the tatably Supportedby' ,theshaftf4'|"and arealter-j withftheirinner 4ends wholly released' from-the groovesiinfthe shaft 4|; When the clutch mem-Y sp'e'ctively. The clutches 54, lt'rSare providedwith may rotate freely relative to'y the dlive'mechconnected together'bymeans o f` anactuating 1 rod to'the shaftVV 4| inth'erma'nner shownfin@ Fig. 7. Heretofore it hasbeen 'found that Without the provision ofth'e 'interlocking clutch plungersberotation was vimparted by 'the clutch discsfeven Whenthe latter Werein their released position, 62p1f0j tingwithina notch `or recess 63y formed Whichcausedtheshaftfdlfto'rotate, but by the imaginable atuatingqrqd 64;; This mais slid- Myguide@ atras-mt? endf'withm tortk es formedjingaj ratest-- s sjsuitably attached tojthe frame, Aand ""r od` is threadedat BI throughoutza {poi-tionr rof its-flengthfafnd isjconnectedj'to a rotatable Vadju sting'nlt 88. f Fomedon' thi/si nut is jabevel. 'gear `69jrr1 eshin g Withabevel gearf 'l0 Aentirely eliminated..

mechanism" between the clutch lactuating rods 64 and" "|5, as shown ,in Fig.51. This interlock mechanism comprises' a slide member 9| suitably tatably supported itnirrthefit'tr'ne. Secured to shaft is an `'operatinghandle' handle 92. 'Iheopposite' ends of this Aslide member arelprovidedwithcam surfaces 93 Whichare videdwith similar control mechanismincluding '19. lThe clutch applyingmembers 59 and 13 are are adapted to `engage'plungers 84 carried With shiftedin `one., c iireetionor the other, one or the other of [the-sets of plungers-y is engaged, thereby f or thefother to swing the fshipper lyokefahout its` pivot, and as fa* result', theclu'tch applying--memy' ber, togethery with the member` 8 It are shifted intolAstlre ifriterlocking` mechanisms and 5I are identical" riv "strictur'g fthe" 'descriptionof #the mthani'smfau wiilsmce f ortoth. As shownythe i ,Y clutch 'member 8| is internally grocwed'atiafndy i. isv provided withI oppo'sitelyc'lisposed cam surfaces, 86. Projecting-within the'fgroove 85 in' the clutch member, vWherrthelatter isih the LAposition shown' infEiglj/i, arefclutchplungers] 'slidably-'niount--f `larges pjqrtion s2 ofthe houowshaft 832i' The shaft- :il:v 5 Each. of the,clutch` plungers is provided With anfinclined surfaee'which is complementary Figg- 45; the` clutchA jplungers of the interlocking mechanism 4D-@are v held by the coiled springs Withinf'thejannular recess "85 in the rn-zrnberv 8| A freely within? the hc'wllowshaft18,3.v vI-Iovveve i',"yvhe'n the'clutchfapplyingmember 581s moved `toward a positionto apply one of the disc clutches, Athe the mechanismpthereisfprovide'd an interlock Mito vanrannular clutch member 8|' slidably formed onaqhollow shaft l83 suitably journaled i be se'errfthat'whenfthe clutch operating` handley 'j isrotated'Qrotation ofthe nutimparts axial*v i vv lthusbejseen'tha Whenoneorfthe otherofn plungersji areconstantlyurgedlintotheir-outer the' clutches;44,39iisfapplied and theintjer: released positions by coil'springs 89. fThe inner i ber -59i`s"'in"this` position; the disc'clutches 35i-. andr ML are both released. At this time the shaft` i anism,"the `shaft` upon rotation thereof; turning shaft IHv,l thereby connecting the hollow shaft'il3`4 ttt/eertthel hollow shaft '83 andtheshaft 4|,drag

guided 'on' the frame and 'having ian operating v 'site position,y the rod. 15 is held against moyeme'h' thefimprvedfmmi new @hitch M i eiiimg--mechal1ism a.

,able keif cutter, "and mechanism Afor swinging e may" be'moved :iler-jrg*- III sam keria-Litter relativsm said passinmdmg a speeds'in onefdirectionT aiv separate Iagst a'rd 510W V'atfasc amk slow' speeds',` separate fast and VStow @eed VQr arisrnssiqn' gearing for also; effecting kei; rcutter swingabout said' pivtIatfasUarid-slow r'neryrber gliel-*prem ling-mechanism and s mmmgm'scnmeia; @orgasme bqseikerfl 'me l transmissi getti-ings 1 said transmission gearmgs.

uiting prdpe rvigfl: merits 1 afg? said axes; ambasepropenm sperme snrwgn" i. -5

member arriged wfshitsfaxfsvrmg ma vertical cutter,- jmeengnismf-or swinging sai-fingers base, Q and-mec;hanism rfo'rj nismincluding a1- swnga itsfpivvdi'- udfiiig Y arismissllon mech? elemenisef said/transmissionmechanisms ari ranged onA horizontal axes, .andi` machine :.Pl'Q- sion, mechanisms.

peiling:meansqoperable. through aidgtransrnis-f.,

missionffmeehanism foreffeting,swinginapi the., kerf cutter at aslow cutting. speed' inthe opposite Y *n direction, atheil terminal elements ofl k; klsaid'.straxis: 151' i and 'machine.1propelling: means 1 operable through` .y said transmission.mechanisms-. j 1110.. Inga mining-machine, .kerf lei1fv..ti.1.1lf .111.601.1-y

eiectins .swinsinefieithe -kerfeutter:atie slewy 'cutting :gspecd in 'onedirection; a; separate f distinct*v transmission..mechanisrn'lifor .swineirieeitheg-kerf generataslewveiiiiins ride.. .ai-1e hish'- posiionilisspeed in-ihefepnesiie Y rection, ,the terminal: elements. yof said transmis sionmechanisinssgarranged in horizontal-ax Y and machine `pipelling.meansOnerelslifihljolieh.

said .transmissiong:mechanisms;c A 1 1; j Ingarnining Qmachine, macH ne.,propel1 ing means..infiludirie-ffemrerellins meinberferreneed. With its exis lying' :inrayeiticel 11.12116" @315894195 transversely .sf..t1ie..-riieeliiii-e.` ai -pluraliprejdefl termine speed. transriiissi.en1;.mechanism i f drivins;saidfprepelling fme.11111912.12l teplilfrslii.. .0fvspeeds ene direetiemend e. sparate .eiiddisftinct lplural prdetermlled. vr'S'Died lalsrni'ssion l mechanism; for; :driving: seid.: P1.spelling; member. atl .the samei speedsginf-thegreverse direction.

. v12.111 aminirisfmeehirie maehiheipmlellllgmeans-including 'a propelling. member arranged withits-.axisiyinsiin .a-vertieslfplene extending; 'transversely Oiiheraehinea transmission-'manif l ber Yat the saniefl the revegrsef.

means includinga `propelling,-'meniber .arranged withr its axis'lyiiis e-.veiiicel piene exi/sliding.' Atransversely of vthe machine,l aAplufrgalrpredeter:v

n mined s`peed. transmission mechanism for driv'- 60 A x u a :i r .le Inemininameehne, kerfcuiii... Hiss.

Yswinging movementthereoh mahinelpropelling means .including-1 `-vepropelling member., .e sommen irsrismissienfmeehsnism ferfzeffeeiiilslief @Hirsi 1 Swing` and. drive ref-rseiii. 1erep'sllixi'c` ilneirfibe'rrat e low cutting speedfin` one direction, andaseparate and distincttransmission.mechanism/forfeiecting1 swinging ,of the kerf cuttery and drveof Ithe..prd-` Vpeiling memberbethei slew 1ii11ig` .Speed in' the w15.: les mining-machins, ;-1. srf ...itiriemee- .nismfineludins a. swingebleksrf llltteffhefvirigfifs piv0t-..dispesed..1si;righi angles ite the plane missionmcchanisms arranged on horizontalaires,

n transmission mechanism fr'effectingfkerf cutter! s wingf and .drive ofi. said propelling. member.at,a.v flowcutting speedjiny ne direiin,V yand a separate'j mechanism.fer'swinging.saidakerfaeiltter;ebeuiits: .pivotincluding@aptransmissiony mechanisrdfor, I l `'and at a relativel high spee f. mechanism-unc 'transmis on mechanismgfor driving' said shaft.

19.`.In `al'. raining machinakerfjcuttr lfeedingy mechanism includingga sliafjtarranged'- with its axisglying. in .a fverticalIplane extending Atrans-V 'transmission'mechanism. for .driving said shaft 'iria said; propelling' Ameiribei .atierizlurzeliiy: :0i

,speed transmission mechanism. for driving said resetear' Y -low cuttingspeedyand-arelativelv high speed in @c ireetien, snide seperate; endfdistinet .trans-- mission mechanism fergeiiectine swinging ofthe kerf. cutter-fendndriveeefilie. prepellins member both at lAa lowA cutting *speedr thereverse direciV tion` v A including La swingable lkerfcuttcrl having its .l pivotdisposed :Y at right 4angles'lto the plane oi Swinging.;movement-thereon machine ,propelling` means including a propelling member, arcornmon` and distinct,transmission.niechanism for effectif ilse. swinsinssv ihekreufier and; drive 0f. the: lpropeliing. memberi-bothzat a. low cutting speed,A

,Y transmissionyehanismseach including ias't andf slow,y speed ,driving "gearing ..ande'achvmopeative` i i 30;. thefkerflcutter]admeans for? only. alternatively.'l

mechanisms. l 1 ingrnachine',1kerf. cutter feeding. `I luding ashaftarran'ged with its axis llying i a. 'verticaliplanel .extending transverselyfofff the.' machine; lal ".fast. yaridlislovv speed -rectio1'1,`A [and a "separate -and 'distinct fast 'and speed transmission mechanism .for driving 'Y said shaft at pre'deternv ed'fast and' slow speeds inthe reverse direction.,` 1 l 4.6v

vrselylof'thellmachine,.a 4[fast and vslow speedv atA predetermined 'fa'stand slow speeds in one l direction', and a` separate and distinct fast and s lowspeedtransmission `mechanismior driving n said 'shaftfat' predetermined fastfand `slow speeds inthe-reverse directionkerf cutter feeding ele'- inentsgan'd rheansoperable at will -.for selectivelyV connecting said elements inj drivngrelation with` saidshaftgfjl ..20.`4Inj,'rmining machine, kerf cutter feeding mechanismfincludingashaft,` a lfast and slow n shaft'fatj predetermined fast andfslowfspee'ds in Zonendirectiomfand a separateand vdistinct, fast 'and slow'speed` transmission'mechanism for ldriv-A f ingsai'dfshaft 'atpredetermined fast and slow` speeds` inV thareverse direction, eachtransmissionmechanism including a driving element `coaxialv4 A.vvitlfsaid l"shaft, and operator-controllable inft'jerlockingv .clutch mechanism forj alternatively connecting said 'driving elements to saidfshaft,

2.1.2111'l agniiningmachine, kerfnr cutter feeding 70 mechanismincluding a shaft, a'fast yand slow s'peediftransmission'mechanism for driving said f shaft'atjpredetermined', fast and slow speeds ini one'dire'ction, andfa separate and ldistinct vfast andv slow'speed transmission mechanismfor driv- 16. In a'mining machine; kerfcutting mechafgj l .mechanism including a shaft, a' fast' speedsiin' the reverse dir eeticn,A each transmi mechanism including slowispeed terminal" ing said shcftat' predetermined `fast andslovv L c tion, eachltransniis o selectively rendering saiiijgears eireet speed transmission j mechanisni'-for driving s 'shaft at predetermined kvfast and slow "speeds -'in ands'low spee'cltransmission mechanis me saicshaft at pred-fiancee@ ressenti eehanism including; relatively fontaine frasi "and slow speed terminal gears 'coaxial with-'said Seid ie'ieelheismispeed resem-@1e :en ef which era shaft, clutch mechanismoperableat will :for-

'selectively 'renderingfsaid gears?eiectiveitcdrive said and. onatorcentrolleble riterlgck:

ing clutch mechanism 4-i n` "t l ie drive between 'said mechanisiri y 'including a sha'i't a ifast'i and-"slow .speed transmission 4mechanisrnfior driving said shaftat 'predetermined fast an s slowjspee Aone direction,andfaseparate andfdistinct and Slow Speed transmisin meheeism fer dri-V- ing said `shaft "at p redeterminedy fast fslovv speedslinth'e reverse direction, each transmission Wely rotatablfast'and ren''desire sadeyearsffctii fondi/elsa and 1 operator-controllable interlocking utCh mechanism in 'theldrivebetweensaididriving gears .andiis'aids 'ait Said lijltrlocsin'gielutch, mechanism'lwaydbeingconnected prior"to"`th co nection o fsaid iirst mentioned u c In` i1 24-1Iiierrii'1iirie machine lkerf @uit mechanism 'including' 'a shaft, connections itwerisaid shaft and tiiejierff cutter, andfdiviiig mechanism Stor said shaft infcludin a fastand y 'Zf aimininginacliine, ker-f vcutter fee mechanism including a shaft,l connections be-r tween said shaft and the kerf cutter, separate' lfast and slow speed transmission mechanisms,

each ytransmission mechanism` having fast and slow speedpterminal gears individual theretocfoaxial with said shaft, yindividual Vclutches controlling the transmission of power by each terminal gear, operator-controllable interlocking, clutch mechanism between said'terminal gears and said shaft, relatively rotatable feeding elements oo axial Vwith said shaft, and clutch mechanism operable at will for selectively connecting saidfeeding elements to said shaft.`

26. In a. mining apparatus, a Wheeled truck adapted -to run along a mine trackway, kerf Veutting mechanism on said truckincluding a swing--I able kerl cutter, propelling means for saidtruck including a propelling member, andcommon motor operated mechanism for independently swinging said kerf cutter'andydriving said propelling member at either of two relatively diierent speeds and in either direction at eithe'rspeed; said motor operated mechanism including speed changing tifa, tend siowpeeds @fable-.theme11 Sei-dimes ssionmecnanism.

fxZQ-ilmrafmmins ein table'lfbasexkerfj gmeehanism then'epn ncludingaswingahle mehanismfl-forl eiiectins swmginsciibeisriu pa te estelidfslowaspeed. l

kerreiitten andmeenemeniorswingineisaie reifA ,putter relativetp isaidhase .including alfastjand? ikerf cutter; relative torsaid vbase including afast .and slow sneed @transmission gearingrfforzeffectizing swinginggoffthe-kerf;cutterat iastand-slow speeds in onedirection, a separate-and distinct 7^ 'fast aindnslow @speeds ptiausm issioni` gearingeifor `client-'Jing k@ @utter :swngratdast and slow `speeds fthe @Opposite adirecton; i' :and :basefr: propelling meflisfieperaiblesthmughisaid transmissioni gear.- ings.'

,3 1.. In a mining mechanism for swinging saidl kerf cutterv about eiiecting swinging of thekerfcutter at a slow `cutting speed in .one direction, a separate' and.

distinct transmission mechanism `for eifecting l macnine, 'kerfcuttiing meenanism including a swingable" kerf "cuttef,` and 1 `z its pivot includingl a transmissionmechanism for v` I swinging of the kerf cutter'at Va slow cutting speed in the opposite direction,and machine propelling means, operable through said transmission mechanisms.

32. In a mining niachin'eQkerf cutting mecha- 'nism including, `a swingable jkerf cutter, and

mechanism for swinging, said kerf cutter about' its pivot includinga transmission mechanismfor z' eifectingrswingingof the kerf .cutter. ataslow cutting speed and* ata high positioning speed in onedirection, a separate. and! distinct transmission mechanism for effecting swinging ofthe kerf cutter at ay slow 'cutting speed in the opposite direction,r and .machine propelling. means operable through said` transmission mechanisms.

v1b throughsaid transiriissionmechanisms.=

affitaimimni fr manii;1ierffitfmg meetamechanismfor swinging saidkerf cutter about its "cutting Aspeed kone direction; a I separate and distiilct' trhsmissionzpmechanism for iifesiting swinging ofthe kerf cutter at. a' 'slowycutting andy ata high positioning speeiifinthe opposite direc'- tion, and -machine*,propelling means operable cutting" mechanism :oniA said truck 'including a swingable cutter'y and aj cutter bar swinginginember',l propellingmean's'ffor saidjt'ruck including a 'propelling member operatively connected'to' vthe truck wheels, and Amotor operated' mechanism for independently drivin'gf'saia `tain-ivt'fizg'i'ng fand prot pelling members at'Y either of'two relatively differ-y :ent' speeds l including a horizontal` shaftextending `transversely -of .saidf truck;v operatorcontrollable K A clutch means for connecting fieither'sajid' `h'a'r swinging memberiorfsaidfpropelling member f 'driving relation with `fsaid `transverse shaft; y f asftv; 'Y jand slow speed gearf trains' ea'chfh'aving a -nal' terminal-gearf-coaxialwith'said s'haftgfaiidy operfator-"controll'ableclutch "meansf forff vselectively connectingsaid'trminal gears to said shaft.

` propelling.members at eitherjof two relatively vdifferent speeds including! a horizontalfshaftfex'- Vtending transversely ofrsaid truck, operator-conf trollable Vclutch vn'xearrs-..for"connecting* eitherV said bar swinging 'memher vora said" propelling member f driving relationuwith said transverseshaft, fast llyiconnecting said terminalifworrnwheelsto saidV terminali Wormv wheel Lcoaxial With-isaidshaft, and

:operator-controllable clutch' meansfor- 'selectiveshaft, l

" V36.11'1 a miningfapparatusya Wheeled truck adapted to` run along -am'ine trackwamke'rf `cut- Atingmechanismonrsaidftruckincluding-'a swingfr able cutteriand a'I cutterf;barswingingmembery 4propelling n iearis for said t'ruclr` includinga p'ro;

peiling :member: operativelx'rl @connected to 4the ',truck wheels,` and motor operatedmechanism `for independently driving said bar'swinging -and propelling members -at eithergof twoj relatively different'speeds'iincludingial horizontal shaftexf tending transversely `of saidtrucl, voperator-con#` v trollable clutchjmeans for connetingeither said bar swingingmember or said' propelling member in'zdriving relationj 'with saidtransverse 'shaft, fast andslow speed gear trains each-having a lfinal terminal Worm Wheelcoaxial withsaid shaft, A Worms rotating onl parallel lon'gitudin'allyV extend-Q ing axes 'and meshing'lwith `saidworm wheels,' and operatore`, .zontrollable'r clutch 'means for selective, ly connecting said terminal worin `Wheelsto said 37..',In a mining apparatus,v a' kWheeled i adapted' to alonga mine ktrackvvay, k ferfV cut- 'ting mechanism on said truck' including 'a swing? able kerf cutter, a kerf' cutterswinging sprocketv arrangedat the rearend of said truck andhaving cooperating directly therewith a flexible. swinging' element connected to said" keri. cutter, a truck propelling sprocket y,a'rranged at the rear end of ks 'aidtrucl and having a cooperating flexible con-- nctionwithcthertruck Wheels,;'and motor oper-A ated mechanism for independentlyl driving said .kerf v cutter swinging. sprocketand said propelling "sprocket at either. of two ,relatively Y different speeds and-ineither directionat either speed.' "38. In' v-a4 miningv`r apparatus,V a' wheeled trucky -adapted to alor'ig aminetrackway, kerf cutl Lting mechanismen saidltruck including a swingf able. kerf cutter, aV kerf t critter` swinging sprocket "arranged at therear'end of said truck andv havingv 'cooperating-'directly therewithailexible swinging l element connectedv to' said gkerf cuttergga truck j propelling' sprocket arranged at; 'the' rear endl of saidftruck and havinga cooperating flexible vcon*- .riection With` the' truck wheels," motor operated mechanism ,forf independently ,driving said `kerf .fcuttes'winging 'sprocketjandfsaid propelling sprocket at eitheraof .tworelatively different spee'dsand-ineither direction at either speed, and `means operableat will 'for` separately lout` not'si 'multaneously connecting said lerfAv i cutter swingingl sprocket 'and said truck fprop'elliligV SprocketV ..I1.` vfliiillg` relation' "withAV ,said 'motor ,operate d EERTIFICTE 0F CRRECTION.

Patent No. 1,996,765. April 9, 1935.

MRRIS P. HGLMES.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 4, first column, line 28, claim 10, for "in" read on; and page 5, first column, line 14, claim 22, for "predetrmined" read predetermined; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record oi the case in the Patent Office.

Signed and sealed this 11th day of June, A. D. 1935.

Leslie Frazer (Seal) Acting Commissioner of Patents. 

